LC7872E Datasheet, PDF (16/17 Pages) Sanyo Semicon Device – CD Graphics Decoder

2. 19-byte input command (MGC write)
LC7872E
Address (F4h): lsb [ 0 0 1 0 1 1 1 1 ] msb
Control item: lsb [ 1 - - - - - - - ] msb
Data:
lsb [ - - WV U T S R ] msb; R to W is the subcode input.
This command is executed on the CE falling edge.
3. 19-byte output command (packed data readout)
Address (F5h): lsb [ 1 0 1 0 1 1 1 1 ] msb
Check flags: lsb [ A B C D Q Q P P ] msb
Data:
lsb [ - - WV U T S R ] msb
A = Set to 1 when the following 18 bytes are guaranteed and furthermore this is the first data item read out.
(The readout operation must be completed within 1.1 ms.)
B = 0: Command execution in progress
1: Command wait state
C = VBLANK:Set to 1 during the vertical blanking period
D = Disk identifier flag
0: CD
1: CD-G
Q = QF0 and QF1 (Q error correction flags)
P = PF0 and PF1 (P error correction flags)
Note that when it is not necessary to read out all 19 bytes, the readout can be interrupted at any point in byte units.
(In particular, this command can be used to read out only the check flags.)
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